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<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Student</span>(<span class="hljs-params">name</span>) </span>{
    <span class="hljs-keyword">this</span>.name = name;
}

Student.prototype.hello = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    alert(<span class="hljs-string">&apos;Hello, &apos;</span> + <span class="hljs-keyword">this</span>.name + <span class="hljs-string">&apos;!&apos;</span>);
}
</code></pre>
<p>&#x5982;&#x679C;&#x7528;&#x65B0;&#x7684;<code>class</code>&#x5173;&#x952E;&#x5B57;&#x6765;&#x7F16;&#x5199;<code>Student</code>:</p>
<pre><code class="lang-javascript"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Student</span> </span>{
    <span class="hljs-keyword">constructor</span>(name) {
        <span class="hljs-keyword">this</span>.name = name;
    }

    hello() {
        alert(<span class="hljs-string">&apos;Hello, &apos;</span> + <span class="hljs-keyword">this</span>.name + <span class="hljs-string">&apos;!&apos;</span>);
    }
}
</code></pre>
<p>&#x6BD4;&#x8F83;&#x4E00;&#x4E0B;&#x5C31;&#x53EF;&#x4EE5;&#x53D1;&#x73B0;&#xFF0C;<code>class</code>&#x7684;&#x5B9A;&#x4E49;&#x5305;&#x542B;&#x4E86;&#x6784;&#x9020;&#x51FD;&#x6570;<code>constructor</code>&#x548C;&#x5B9A;&#x4E49;&#x5728;&#x539F;&#x578B;&#x5BF9;&#x8C61;&#x4E0A;&#x7684;&#x51FD;&#x6570;<code>hello()</code>&#xFF08;&#x6CE8;&#x610F;&#x6CA1;&#x6709;<code>function</code>&#x5173;&#x952E;&#x5B57;&#xFF09;&#xFF0C;&#x8FD9;&#x6837;&#x5C31;&#x907F;&#x514D;&#x4E86;<code>Student.prototype.hello = function () {...}</code>&#x8FD9;&#x6837;&#x5206;&#x6563;&#x7684;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x6700;&#x540E;&#xFF0C;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;<code>Student</code>&#x5BF9;&#x8C61;&#x4EE3;&#x7801;&#x548C;&#x524D;&#x9762;&#x7AE0;&#x8282;&#x5B8C;&#x5168;&#x4E00;&#x6837;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> xiaoming = <span class="hljs-keyword">new</span> Student(<span class="hljs-string">&apos;&#x5C0F;&#x660E;&apos;</span>);
xiaoming.hello();
</code></pre>
<h3 id="&#x53D6;&#x503C;&#x51FD;&#x6570;&#xFF08;getter&#xFF09;&#x548C;&#x8BBE;&#x503C;&#x51FD;&#x6570;&#xFF08;setter&#xFF09;">&#x53D6;&#x503C;&#x51FD;&#x6570;&#xFF08;getter&#xFF09;&#x548C;&#x8BBE;&#x503C;&#x51FD;&#x6570;&#xFF08;setter&#xFF09;</h3>
<p>&#x4E0E; ES5 &#x4E00;&#x6837;&#xFF0C;&#x5728;&#x201C;&#x7C7B;&#x201D;&#x7684;&#x5185;&#x90E8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>get</code>&#x548C;<code>set</code>&#x5173;&#x952E;&#x5B57;&#xFF0C;&#x5BF9;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x8BBE;&#x7F6E;&#x5B58;&#x503C;&#x51FD;&#x6570;&#x548C;&#x53D6;&#x503C;&#x51FD;&#x6570;&#xFF0C;&#x62E6;&#x622A;&#x8BE5;&#x5C5E;&#x6027;&#x7684;&#x5B58;&#x53D6;&#x884C;&#x4E3A;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Person</span></span>{
    get getName(){
        <span class="hljs-keyword">return</span> <span class="hljs-string">`my name is <span class="hljs-subst">${this.name}</span>`</span>;
    }
    set setName(value){
        <span class="hljs-keyword">this</span>.name = value;
    }
}

<span class="hljs-keyword">let</span> example = <span class="hljs-keyword">new</span> Person();
example.setName = <span class="hljs-string">&quot;hello&quot;</span>;
<span class="hljs-built_in">console</span>.log(example.getName);
<span class="hljs-comment">// my name is hello</span>
</code></pre>
<p><font color="red"><strong>&#x6CE8;&#x610F;&#x4E0D;&#x80FD;&#x8FD9;&#x4E48;&#x5199;</strong></font>&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Person</span></span>{
    get name(){
        <span class="hljs-keyword">return</span> <span class="hljs-string">`my name is <span class="hljs-subst">${this.name}</span>`</span>;
    }
    set name(value){
        <span class="hljs-keyword">this</span>.name = value;
    }
}

<span class="hljs-keyword">let</span> example = <span class="hljs-keyword">new</span> Person();
example.name = <span class="hljs-string">&quot;hello&quot;</span>;
<span class="hljs-built_in">console</span>.log(example.name);
<span class="hljs-comment">// &#x8FD9;&#x6837;&#x76F4;&#x63A5;&#x62A5;&#x9519; Maximum call stack size exceeded</span>
</code></pre>
<p>&#x539F;&#x56E0;&#x662F;&#xFF0C;set &#x8DDF; get&#x5C31;&#x662F;&#x5BF9;&#x6210;&#x5458;&#x5C5E;&#x6027;&#x7684;&#x5B58;&#x53D6;&#xFF0C;&#x5F53;&#x4F60;&#x8C03;&#x7528; this.name&#x7684;&#x65F6;&#x5019;&#x5982;&#x679C;&#x540E;&#x9762;&#x8DDF;&#x4E86;&#x8D4B;&#x4E88;&#x7684;&#x503C;&#xFF0C;&#x5219;&#x4F1A;&#x8C03;&#x7528;&#x5BF9;&#x5E94;&#x7684;set&#x65B9;&#x6CD5;&#xFF0C;&#x5982;&#x679C;&#x540E;&#x9762;&#x6CA1;&#x6709;&#x8DDF;&#x503C;&#xFF0C;&#x5C31;&#x662F;&#x83B7;&#x53D6;&#xFF0C;&#x5219;&#x4F1A;&#x8C03;&#x7528;&#x5BF9;&#x5E94;&#x7684;get&#x65B9;&#x6CD5;&#xFF0C;&#x4E0A;&#x9762;&#x662F;&#x56E0;&#x4E3A;&#xFF0C;&#x5728;&#x7ED9;name&#x8D4B;&#x503C;&#x7684;&#x65F6;&#x5019;&#xFF0C;this.name = value,&#x7136;&#x540E;&#x5B83;&#x4E00;&#x76F4;&#x8C03;&#x7528;set name &#x65B9;&#x6CD5;&#xFF0C;&#x6CA1;&#x6709;&#x5C3D;&#x5934;&#xFF0C;&#x8FD9;&#x6837;&#x5F53;&#x7136;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<h3 id="&#x9759;&#x6001;&#x65B9;&#x6CD5;">&#x9759;&#x6001;&#x65B9;&#x6CD5;</h3>
<p>&#x7C7B;&#x76F8;&#x5F53;&#x4E8E;&#x5B9E;&#x4F8B;&#x7684;&#x539F;&#x578B;&#xFF0C;&#x6240;&#x6709;&#x5728;&#x7C7B;&#x4E2D;&#x5B9A;&#x4E49;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x90FD;&#x4F1A;&#x88AB;&#x5B9E;&#x4F8B;&#x7EE7;&#x627F;&#x3002;&#x5982;&#x679C;&#x5728;&#x4E00;&#x4E2A;&#x65B9;&#x6CD5;&#x524D;&#xFF0C;&#x52A0;&#x4E0A;<code>static</code>&#x5173;&#x952E;&#x5B57;&#xFF0C;&#x5C31;&#x8868;&#x793A;&#x8BE5;&#x65B9;&#x6CD5;&#x4E0D;&#x4F1A;&#x88AB;&#x5B9E;&#x4F8B;&#x7EE7;&#x627F;&#xFF0C;&#x800C;&#x662F;&#x76F4;&#x63A5;&#x901A;&#x8FC7;&#x7C7B;&#x6765;&#x8C03;&#x7528;&#xFF0C;&#x8FD9;&#x5C31;&#x79F0;&#x4E3A;&#x201C;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#x201D;&#x3002;&#xFF08;&#x8DDF;java&#x5DEE;&#x4E0D;&#x591A;&#xFF09;</p>
<pre><code class="lang-javascript"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Foo</span> </span>{
  <span class="hljs-keyword">static</span> classMethod() {
    <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;hello&apos;</span>;
  }
}
</code></pre>
<h3 id="class&#x7EE7;&#x627F;">class&#x7EE7;&#x627F;</h3>
<p>&#x7528;<code>class</code>&#x5B9A;&#x4E49;&#x5BF9;&#x8C61;&#x7684;&#x53E6;&#x4E00;&#x4E2A;&#x5DE8;&#x5927;&#x7684;&#x597D;&#x5904;&#x662F;&#x7EE7;&#x627F;&#x66F4;&#x65B9;&#x4FBF;&#x4E86;&#x3002;&#x60F3;&#x4E00;&#x60F3;&#x6211;&#x4EEC;&#x4ECE;<code>Student</code>&#x6D3E;&#x751F;&#x4E00;&#x4E2A;<code>PrimaryStudent</code>&#x9700;&#x8981;&#x7F16;&#x5199;&#x7684;&#x4EE3;&#x7801;&#x91CF;&#x3002;&#x73B0;&#x5728;&#xFF0C;&#x539F;&#x578B;&#x7EE7;&#x627F;&#x7684;&#x4E2D;&#x95F4;&#x5BF9;&#x8C61;&#xFF0C;&#x539F;&#x578B;&#x5BF9;&#x8C61;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x7B49;&#x7B49;&#x90FD;&#x4E0D;&#x9700;&#x8981;&#x8003;&#x8651;&#x4E86;&#xFF0C;&#x76F4;&#x63A5;&#x901A;&#x8FC7;<code>extends</code>&#x6765;&#x5B9E;&#x73B0;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">PrimaryStudent</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Student</span> </span>{
    <span class="hljs-keyword">constructor</span>(name, grade) {
        <span class="hljs-keyword">super</span>(name); <span class="hljs-comment">// &#x8BB0;&#x5F97;&#x7528;super&#x8C03;&#x7528;&#x7236;&#x7C7B;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;!</span>
        <span class="hljs-keyword">this</span>.grade = grade;
    }

    myGrade() {
        alert(<span class="hljs-string">&apos;I am at grade &apos;</span> + <span class="hljs-keyword">this</span>.grade);
    }
}
</code></pre>
<p>&#x6CE8;&#x610F;<code>PrimaryStudent</code>&#x7684;&#x5B9A;&#x4E49;&#x4E5F;&#x662F;class&#x5173;&#x952E;&#x5B57;&#x5B9E;&#x73B0;&#x7684;&#xFF0C;&#x800C;<code>extends</code>&#x5219;&#x8868;&#x793A;&#x539F;&#x578B;&#x94FE;&#x5BF9;&#x8C61;&#x6765;&#x81EA;<code>Student</code>&#x3002;&#x5B50;&#x7C7B;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x53EF;&#x80FD;&#x4F1A;&#x4E0E;&#x7236;&#x7C7B;&#x4E0D;&#x592A;&#x76F8;&#x540C;&#xFF0C;&#x4F8B;&#x5982;&#xFF0C;<code>PrimaryStudent</code>&#x9700;&#x8981;<code>name</code>&#x548C;<code>grade</code>&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5E76;&#x4E14;&#x9700;&#x8981;&#x901A;&#x8FC7;<code>super(name)</code>&#x6765;&#x8C03;&#x7528;&#x7236;&#x7C7B;&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x5426;&#x5219;&#x7236;&#x7C7B;&#x7684;<code>name</code>&#x5C5E;&#x6027;&#x65E0;&#x6CD5;&#x6B63;&#x5E38;&#x521D;&#x59CB;&#x5316;&#x3002;</p>
<p><code>PrimaryStudent</code>&#x5DF2;&#x7ECF;&#x81EA;&#x52A8;&#x83B7;&#x5F97;&#x4E86;&#x7236;&#x7C7B;<code>Student</code>&#x7684;<code>hello</code>&#x65B9;&#x6CD5;&#xFF0C;&#x6211;&#x4EEC;&#x53C8;&#x5728;&#x5B50;&#x7C7B;&#x4E2D;&#x5B9A;&#x4E49;&#x4E86;&#x65B0;&#x7684;<code>myGrade</code>&#x65B9;&#x6CD5;&#x3002;</p>
<p>ES6&#x5F15;&#x5165;&#x7684;<code>class</code>&#x548C;&#x539F;&#x6709;&#x7684;JavaScript&#x539F;&#x578B;&#x7EE7;&#x627F;&#x6709;&#x4EC0;&#x4E48;&#x533A;&#x522B;&#x5462;&#xFF1F;&#x5B9E;&#x9645;&#x4E0A;&#x5B83;&#x4EEC;&#x6CA1;&#x6709;&#x4EFB;&#x4F55;&#x533A;&#x522B;&#xFF0C;<code>class</code>&#x7684;&#x4F5C;&#x7528;&#x5C31;&#x662F;&#x8BA9;JavaScript&#x5F15;&#x64CE;&#x53BB;&#x5B9E;&#x73B0;&#x539F;&#x6765;&#x9700;&#x8981;&#x6211;&#x4EEC;&#x81EA;&#x5DF1;&#x7F16;&#x5199;&#x7684;&#x539F;&#x578B;&#x94FE;&#x4EE3;&#x7801;&#x3002;&#x7B80;&#x800C;&#x8A00;&#x4E4B;&#xFF0C;&#x7528;<code>class</code>&#x7684;&#x597D;&#x5904;&#x5C31;&#x662F;&#x6781;&#x5927;&#x5730;&#x7B80;&#x5316;&#x4E86;&#x539F;&#x578B;&#x94FE;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x4F60;&#x4E00;&#x5B9A;&#x4F1A;&#x95EE;&#xFF0C;<code>class</code>&#x8FD9;&#x4E48;&#x597D;&#x7528;&#xFF0C;&#x80FD;&#x4E0D;&#x80FD;&#x73B0;&#x5728;&#x5C31;&#x7528;&#x4E0A;&#xFF1F;</p>
<p>&#x73B0;&#x5728;&#x7528;&#x8FD8;&#x65E9;&#x4E86;&#x70B9;&#xFF0C;&#x56E0;&#x4E3A;&#x4E0D;&#x662F;&#x6240;&#x6709;&#x7684;&#x4E3B;&#x6D41;&#x6D4F;&#x89C8;&#x5668;&#x90FD;&#x652F;&#x6301;ES6&#x7684;class&#x3002;&#x5982;&#x679C;&#x4E00;&#x5B9A;&#x8981;&#x73B0;&#x5728;&#x5C31;&#x7528;&#x4E0A;&#xFF0C;&#x5C31;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x5DE5;&#x5177;&#x628A;<code>class</code>&#x4EE3;&#x7801;&#x8F6C;&#x6362;&#x4E3A;&#x4F20;&#x7EDF;&#x7684;<code>prototype</code>&#x4EE3;&#x7801;&#xFF0C;&#x53EF;&#x4EE5;&#x8BD5;&#x8BD5;<a href="https://babeljs.io/" target="_blank">Babel</a>&#x8FD9;&#x4E2A;&#x5DE5;&#x5177;&#x3002;</p>

                                
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